QShowpost: Now On GitHub

QShowpost is a command line utility for examining the queue levels of a
Postfix server How many messages are delayed? How many are in the Hold
Queue? QShowpost will give you those answers.

It is a compiles tool using Qt4 in C++. It supports multiple instances
per box - you simply edit the config file to add a new instance and
define where it is. It can run in one-shot mode (default) or, if passed
a numeric option, will run continuously updating every number of seconds
passed into it.